You want to know which countries Facebook has made the greatest inroads into? Happy to help.

With data from Nick Burcher, plus some data about the world population (thanks, Wikipedia), plus a little bit of SQL, plus OpenHeatMap, we've got an interactive map you can play with to see where Facebook is all-conquering - specifically, which countries it has the largest (and sometimes smallest) number of the population signed up for, in hitting its 500 million user mark.

So here's the map. (Note: can be slow to load.)

And below is the data, as a handy table - country, Facebook users, population, and percentage penetration.

If you have more data about countries that aren't on this list then please add them in the comments.

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